Loom attachment



March 30, 1937.

| N. SILVER 2,075,668

LOOM ATTACHMENT 2 Sheets-Sheet 1 Filed May 15, 1956 INVENTOR.L.N.SILVER.

ATTORNE March 30, 1937. L. N. SILVER LOOM ATTACHMENT Filed May 15, 19362 Sheets-Sheet 2 FIG.5

FlG.7

A TTL RNEY.

Patented Mar. 30, 1937 UNITED STATES PATENT OFFICE LOOM ATTACHMENTApplication May 15, 1936, Serial No. 79,991

1 Claim.

Generically, this invention relates to looms but it more specificallyrelates to the so called smash protection mechanism of a loom.

In known types of looms it is customary to pro- 5 vide a dagger ordaggers which are mounted on a protector rod journaled in bearings onthe lay of the loom. Spring means of any suitable form are usuallyassociated with this protector rod and so disposed with respect theretoand to the lay of the loom that they always urge the dagger or daggersin a direction which will cause them to come in contact with the steelsin the frogs or with other members adapted to stop the motion of thelay. Sincethe spring means just referred to always tend to throw thedaggers into engagement with the steels, it is essential that as long asthe loom is operating in a normal manner that means be provided toprevent such engagement, otherwise the lay would be arrested by suchengage- 2 ment at every beat.

protector rod, thus rotating said protector rod against the action ofthe spring means aforementioned. In this manner the load on the springmeans is carried directly by the shuttle, the binder finger, the shuttlebox, and associated parts and the daggers are thus prevented fromstriking the steels in the frogs and stopping the loom. In case,however, the shuttle should fail to enter either box it will be seenthat there will be nothing to prevent the spring means aforementionedfrom rotating the protector rod and the dagger or daggers attachedthereto into the position of protec- ,tion thus stopping the lay andpreventing a so called smash or breakout.

It will also be obvious and, in fact, has long been obvious to thoseskilled in the art that the conventional form of mechanism which hasjust been"de- Furthermore in order to overpower the action of theprotector rod spring it'is necessary for the shuttle to move into andout of a so called tight box thus causing a large increase in powerconsumption not to mention the excessive wear re- ,55 sulting from thetight contact between fast moving unlubricated parts, i. e. the shuttle,the shuttle box, and the binder. In fact the power loss due to thepresent form of operation is so high that even the simple mechanismwhich forms the subect matter of this application and which acts so asto carry the spring load above referred to and allow the shuttle toenter and leave a loose box, consistently shows a power saving of overnine per cent (9.0%).

The invention which forms the subject matter of this application isdesigned to relieve the shuttle of practically all of the spring loadabove referred to and allow it to enter and leave aloose box and also,when properly adjusted, the invention either entirely prevents ormaterially reduces the motion of the daggers, the protector rod, thebinder, the binder finger, and associated parts thus further reducingpower losses. as well as wear and tear on said parts. Although theinvention, which may incidently be attached to any conven tional form ofloom or made an integral part of a loom, does prevent or reduce themotion of the various parts of the loom just referred to and alsorelieves the shuttle of all spring load except during that portion ofthe beat when the shuttle is idle and in stationary position, as will behereinafter explained, it should not be assumed that failure of theshuttle to enter either box will not instantly allow the spring meansaforementioned to rotate thedaggers into the position of protection thusstopping the lay and preventing a smash.

Referring now to the drawings which form a part of this application andin which like characters of reference refer to like parts throughout theseveral views.

Fig. 1 is a broken away perspective view of the preferred embodiment ofthe invention showing a portion of the protector rod and associatedunits of a conventional form of loom and showing the invention whichforms the subject matter of thisapplication in place thereon.

Fig. 2 is a sectional elevation of the preferred embodiment of theinvention in place on a loom. This section is taken along the line 2-2of Fig. 1. In this View the position of the daggers and associated partswhen the shuttle fails to enter the box and when the lay is in theforward position is indicated by the dotted lines.

Fig. 3 is a sectional elevation of the preferred embodiment of theinvention in place on a loom. This section is taken along the same linesas those indicated in Fig. 2. In this view the lay is shown in itsforward position but with the shuttle in the box and with the daggersclear of the steels.

Fig. 4 is a side view of the preferred embodiment of the inventionshowing in this case the form which the pitman arm fitting must have inorder to clear certain parts of the lay.

Fig. 5 is a front View of the special form of pitman arm fitting whichis shown in side View in Fig. 4.

Fig. 6 is a diagram which shows the motion of the end of the pitman armfitting with respect to the lay during one beat of the lay. This diagramis included in order that the operation of the device may be morereadily understood.

Fig. '7 is a side view of a further modified form of the inventionshowing in this case a roller on the end of the protector rod fitting.

Throughout the several views only so much of the loom is shown as willenable one skilled in the art to imderstand the location and operationof the invention.

Referring now to the characters of reference (I) refers to the lay ofthe loom, (2) to the protector rod, (3) to the protector rod spring, (4)to the pitman arm, (5) to the sword, ((5) to the dagger, ('I) to theshuttle box, (8) to the shuttle box binder, (9) to the binder finger,(ID) to the picker stick, and (H) to the side frame of the loom. Thefrog which is adapted to be struck by the dagger whenever the shuttle isnot in its box is indicated by the numeral (|2). The crank arm whichactuates the lay is indicated by (l3) the bearing which supports thepitman arm is indicated by (M), and the collar which receives one end ofthe protector rod spring and which is fastened onto the protector rod isindicated by the numeral (l5). The pitman arm is mounted in the forkedyoke (l6), which is attached to the back of the lay (I) just above sword(5), by means of the pin (II) which is mounted in the bearings (I l).The various parts which have just been referred to and indicated by thenumerals from to I! inclusive are conventional in every respect both asregards their construction and location, but not in all cases as regardstheir mode of operation as will be hereinafter explained. Mounted on thepitman arm (4) and attached thereto by a bolt or other suitable fitting(l8) which is preferably so disposed as to permit a longitudinaladjustment is an arm or lever (l9). When used on the conventional formof loom it is usually necessary to bend, form, or otherwise displace theforward portion of this lever as shown in Figs. 4 and 5 so that it willpass to one side of the forked yoke (l6) which is mounted on the back ofthe lay and adapted to receive the forward end of the pitman arm. It isalso desirable, although not always essential, to so form the member(l9) that its forward portion is located at a lower level than the topsurface of the pitman arm to which it is attached. In the preferredembodiment of the invention as illustrated in Figs. 1, 2, 3, 4, and 5,the forward end of the member (:9) is supplied with a pin (20) uponwhich a roller (2|) is mounted in any suitable manner, the pin (26) isso disposed that its axis is forward of the axis of the pin (H) whichsupports the forward end of the pitman arm.

The operation of the invention can be best understood by referring toFigs. 2, 3, and 6. In these figures it will be seen that during thatportion of the stroke when the crank arm is in the first and secondquadrants, i. e. above the horizontal, and the lay is moving backward,that the roller (2| will be in its lowest position since it is mountedahead of the pitman arm pivot axis When the roller (2|) is in its lowposition it will press down on the protector rod contact fitting (22),which is an important unit of the invention and thus will carry the loadof the spring (3). When the load of the spring (3) is carried by thecontact member (22), the special extension lever (l9) the pitman arm(4), and its associated fittings, in this manner, it will be obviousthat the binder finger (9) and the binder (8) will be relieved of allload and the shuttle which normally picks during this phase of the loomcycle can enter and leave a so called free box. During the extremeforward portion of the stroke, however, when the crank (i3) is justleaving quadrant} and passing into quadrant 3 and also during the entireforward stroke the roller (2|) will be elevated slightly which willallow the spring (3) to rotate the protector rod (2) and press thebinder finger (9) against the binder (8). During this phase of the cyclethe load of the spring (3) will be carried by the shuttle (23), thebinder (8), and the side of the shuttle box (24), as will be seen bereference to Fig. 3. If the shuttle should, however, for any reason failto be in its box during this phase of the loom cycle, a conditionillustrated by the dotted outline shown in Fig. 2, then the spring (3)will be unsupported and will rotate the protector rod (2) through asmall angle thus depressing the dagger (6) which will strike the frog(l2) and stop the loom through the medium of the conventional smashprotection mechanism (not shown).

In actual practise it is usually desirable to form a special contour onthe surface of the contact fitting (22) thus improving the operation ofthe invention and prolonging the life of the various parts. It will beobvious to those skilled in the loom art that the roller (2|) could bemounted on the contact fitting (22) without affecting the operation ordeparting from the spirit of the invention in any way, and such a formof construction is illustrated in Fig. 7. In fact by suitably shapingthe parts (l9) and (22) the roller (2|) can be dispensed with entirelyand such a form of construction was actually used during the earlystages of the development of the invention. In this case, however, acertain amount of sliding friction is bound to occur even when the parts(I 9) and (22) are very carefully shaped and for this reason the entireomission of the roller is not recommended.

It will be seen from the foregoing disclosure that I have invented asimple and practical device which will materially reduce the wear andpressure on certain of the major units of a loom and will also reducethe power required to operate the loom. Having therefore fully disclosedmy invention and the best mode of putting it into practise, I claimbroadly as follows:

In combination with the lay of a loom, a shuttle, a shuttle box, adagger, and frogs adapted to be struck by the dagger to stop the lay, abinder and a binder finger, a protector rod and a protector rod spring,adapted to operate said binder finger and said dagger, a pitman armpivoted to said lay and a crank to impart to said lay, by means of saidpitman arm, a fore and aft motion, means for holding the binder fingerclear of the binder, against the action of the protector rod spring,during the time that the shuttle is in motion across the lay but notduring the forward stroke of the lay, means adapted to allow theprotector rod spring to move the dagger into engagement with the frogfor stopping the lay in case a shuttle should fail to be properly boxed,said means comprising an extension arm, mounted on the pitman arm, acontact member mounted on the protector rod and so disposed with respectthereto that during a portion of the backward stroke of the lay the endof the pitman arm extension member will depress the contact arm againstthe action of the protector rod spring thereby relieving the binderfinger, the binder, and the shuttle of the load of the protector rodspring and allowing the shuttle to enter and leave a free box.

LINCOLN N. SILVER.

